exam Maths Puzzle Numerical Ability

y=2x-1

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exam Other Question

When there is only 2 I have no trouble but when 3 or more is added I get all messed up.

Solve each of the following systems of linear inequalities graphically.

3x-y<=6
x>=1
y<=3 When doing input and out put graphing, if the output starts at a high number do you start at the bottom and go up?